Arduino Uno fingerprint sensor testing program

unotest.ino

#include "SoftwareSerial.h";

const int Rx = 2;
const int Tx = 3;

SoftwareSerial mySerial(Rx, Tx);

const byte txBuf[] = {0xF5, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x0C, 0xF5};
byte reply[] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};


void setup() {
  pinMode(Rx, INPUT);
  pinMode(Tx, OUTPUT);
  Serial.begin(9600);
  while (!Serial) {
    ;
  }
  Serial.println("Starting");
  mySerial.begin(19200);
  
  while(!mySerial) {
    ;
  }
}

void loop() {
  while(mySerial.available()>0)mySerial.read();

  Serial.println();
  delay(1000);
  while(mySerial.available()>0)mySerial.read();
  mySerial.write(txBuf, 8);
  for (int i=0; i<8; i++) {
    reply[i] = 0x00;
    Serial.print(txBuf[i], HEX);
    Serial.print(" ");
  }
  Serial.println("\nGetting data");
  delay(1000);
 
  while(mySerial.available()<8){};
  int i=0;
  byte x;
  while(mySerial.available()>0){
    x = mySerial.read();
    reply[i] = x;
    Serial.print(x, HEX);
    Serial.print(' ');

    i++;
  }
  Serial.println();

  if(reply[0]==0xF5 && reply[4]== 0x03 && reply[7]==0xF5){
    while(mySerial.available()>0)mySerial.read();
    Serial.println("SUCCESS");
  }
  else{
    while(mySerial.available()>0)mySerial.read();
    Serial.println("FAIL");
  }
  delay(1000);
}